What's the meaning of“ u/m documents ”？
All visitors to Embassy of India, Beijing need to establish genuineness of their identity at the Gate No 2 of EoI. In this regard, the u/m documents will be produced by all visitors at Gate No 2, EoI for scrutiny by security assistants on duty

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Maybe "undermentioned" but I've never seen "u/m". I don't work in contract law, so perhaps this is more common than I know, or maybe it's substandard English. I'll let someone else comment on that.